I decided to put my fan inside the shroud on the deck, and to upgrade my cooling. My old system had an inherent weakness, simply that the Hayden fans were not good in the rain. They were not manufactured to lay out in the open on their side, and retained water in their bearings. Alot of work with the manufacturer, who was very good about it, showed that my deck application needed to be shrouded to use the fan to its potential.

My thanks goes to FrancisT who inspired this mod. Here is the scoop, (it is a big one )



I mounted the fan with easy access by having it attached at the back to the deck directly, and at the front by aluminum stands which can be removed really fast for any service or mod work. Notice the angle because my carb setup is pretty tall and I needed the clearance.



As you can see, I am still working out the clearance which is just about there, but was a little shy of correct at the outset.

The system is controlled by a Derale fan control unit which controls both the rad fan and the auxilliary fan. The thermostat is 180* and the fan kicks in at about 183*.



If I can do a deck scoop fan, (as does FrancisT) then anybody can. Hope this helps somebody.

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Where did the deck scoop come from?

It's a fiberglass unit I bought on ebay from a guy in Florida.

There are lots out there though. It is called a "sixpack" and you'll find some at JC Whitney amongst others.

Arn

Got a picture slightly back so I can see the whole rear?

Also, which way does the fan move the air?

The fan is 10" and blows 650 cfm of air downward. The reason is that the air moves, while underway, up the back bumper and forward along the deck. The intake takes advantage of the natural air flow. You will also notice a grill work on the right side. This is so that the alternator gets air all the time when the car is moving.



Quite a bit of air moves under the spoiler and into the opening of the scoop, like this dust test showed.



Arn

You may acheive better results if you use it as an exhaust fan. The Fiero engine compartment is cooled from air being captured underneath the engine that flows over and around it and exits at the side vents on the decklid. Put a ribbon on the side vents before you head out and watch the flow of air. By pushing air in the engine compartment you are IMO hindering the natural air movement. Cooling that hot engine compartment is good; just don't believe that your method will improve things much.

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87GT 3.4 Turbo- 0-60 5.2 seconds
2006 3800SC Series III swap in progress
Engine Controls, PCM goodies,
re-programming & odd electronics stuff
" I'M ON THE LOOSE WITHOUT THE JUICE "

As I've explained in other threads, when I tried an exhaust fan, on the highway the force of the air moving forward on the deck completely stalled the fans blowing against it. As for the vents, in tests I ran with Eclipse taking pics, the vents at 100km send air out partially only. The air moves at about 45* to the deck and tries to exit past the sails. I would say about 1/2 the surface area is actually venting, and it is not venting strongly. At low speeds, it likely vents better, but it does not activate the ribbons.

This is the flow you are dealing with



The in-blowing fan works perfectly. In the Fiero engine bay, there is very little air movement naturally over top of the plenum. This is the reason for the trunk blower to cool the alternator and coil. In my system the grating on the passenger side stays open and whenever the car is moving, the air is pumping in the scoop and air pressure is forcing air down on the alternator. Similarly the air will actually cause the fan to rotate while underway.

This has been tested pretty thoroughly, albeit roughly. The guy helping me is Eclipse, and he is an avid radio control jet designer. He knows aerodynamics really well. Look at these aerodynamics. The ribbons wrapped themselves around the spoiler. The ones attached to the roof became tangled tumbling around behind the window. And look at the pic above. That is evidence of very strong air flow under the spoiler, and the speed that test was done at was not over 60 km or 36mph.



Hope this explains it for you.

Arn

typo

[This message has been edited by Arns85GT (edited 07-11-2007).]